SEO4AJAX

AFTER - .htaccess

### Activate the rewrite rule engine
RewriteEngine on

### If the request contains the _escaped_fragment_ query parameter, set a flag to proxify the request to SEO4Ajax
RewriteCond %{ENV:PROXIFY} !true
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{QUERY_STRING} _escaped_fragment_= [NC]
RewriteRule .* - [E=PROXIFY:true,E=REQUEST_PATH:%{REQUEST_URI}]

### If the request is issued by another known bot, set a flag to proxify the request to SEO4Ajax
### Note: the 5 following lines can be commented if you are using #! URLs
RewriteCond %{ENV:PROXIFY} !true
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{HTTP_USER_AGENT} !(googlebot|yandexbot|pinterest.*ios|mail\.ru|seznambot|screaming) [NC]
RewriteCond %{HTTP_USER_AGENT} (bot|spider|pinterest|crawler|archiver|flipboardproxy|mediapartners|facebookexternalhit|quora|WhatsApp) [NC]
RewriteRule .* - [E=PROXIFY:true,E=REQUEST_PATH:%{REQUEST_URI}]

### Proxify the request to SEO4Ajax
RewriteCond %{ENV:PROXIFY} true
RewriteRule ^(.*)$ /CUSTOM_PHP_PAGE_HERE.php [QSA,L]

BEFORE - .htaccess

### Activate the rewrite rule engine
RewriteEngine On

### If the request contains the _escaped_fragment_ query parameter, set a flag to proxify the request to SEO4Ajax
RewriteCond %{ENV:PROXIFY} !true
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{QUERY_STRING} _escaped_fragment_= [NC]
RewriteRule .* - [E=PROXIFY:true,E=REQUEST_PATH:%{REQUEST_URI}]

### If the request is issued by another known bot, set a flag to proxify the request to SEO4Ajax
### Note: the 5 following lines can be commented if you are using #! URLs
RewriteCond %{ENV:PROXIFY} !true
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{HTTP_USER_AGENT} !(googlebot/|googlebot-mobile|yandexbot|pinterest.*ios|mail\.ru|seznambot|screaming) [NC]
RewriteCond %{HTTP_USER_AGENT} (bot|spider|pinterest|crawler|archiver|flipboardproxy|mediapartners|facebookexternalhit|quora|WhatsApp) [NC]
RewriteRule .* - [E=PROXIFY:true,E=REQUEST_PATH:%{REQUEST_URI}]

### Proxify the request to SEO4Ajax
RewriteCond %{ENV:PROXIFY} true
RewriteRule ^(.*)$ http://api.seo4ajax.com/YOURAPIKEYGOESHERE%{ENV:REQUEST_PATH} [P,QSA,L]

### Otherwise, if the requested file is not present on the server, serve the index file
### Note: the 3 following lines can be commented if you are using #! URLs
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule .* index.html [L]

CUSTOM_PHP_PAGE_HERE.php

<?php

//Configuration
$s4aToken = 'YOUR CUSTOM KEY';
$s4aHost = 'http://api.seo4ajax.com/';

function x_forwarded_for() {
    $ip = '';
    if (!empty($_SERVER['HTTP_CLIENT_IP'])) {
        $ip = $_SERVER['HTTP_CLIENT_IP'];
    } elseif (!empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
        $ip = $_SERVER['HTTP_X_FORWARDED_FOR'];
    } else {
        $ip = $_SERVER['REMOTE_ADDR'];
    }
    return $ip;
}

function parse_request_headers() {
    $requestHeadersArray = array();
    $requestHeaders = '';
    foreach($_SERVER as $key => $value) {
        if(substr($key, 0, 5) == 'HTTP_') {
            $requestHeadersArray[str_replace(' ', '-', ucwords(str_replace('_', ' ', strtolower(substr($key, 5)))))] = $value;
        }
    }

    foreach($requestHeadersArray as $key => $value) {
        if($key != "Host" && $key != "Cookie" && $key != "X-Forwarded-For" && $key != "Connection") {
            $requestHeaders .= $key . ":" . $value . "\r\n";
        }
    }

    $requestHeaders .= 'X-Forwarded-For: '. x_forwarded_for() . '\r\n';
    $requestHeaders .= 'Connection: close\r\n';
    return $requestHeaders;
}


$opts = array(
  'http'=>array(
    'method'=>'GET',
    'header'=> parse_request_headers(),
    'follow_location' => false,
    'ignore_errors' => true
  )
);
$context = stream_context_create($opts);

$url = $s4aHost . $s4aToken . $_SERVER['REQUEST_URI'];
$result = file_get_contents($url, false, $context);

if ($result !== FALSE) {
    foreach($http_response_header as $headerLine) {
      header($headerLine);
    }
    echo $result;
}
else
{
    $protocol = (isset($_SERVER['SERVER_PROTOCOL']) ? $_SERVER['SERVER_PROTOCOL'] : 'HTTP/1.0');
    header($protocol . ' 500 Internal Server Error');
}

?>